LM317T Voltage Regulator with Pass Transistor

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According to FEMA electrical fires kill almost 500 people and injure over 2000 more. Most are caused by poor maintenance of electrical appliances, incorrectly installed wiring, overloaded circuits and extension cords. The holiday season is quickly approaching when we all start to decorate and use our electronics more heavily. In fact, I have already seen Halloween decorations in many neighborhoods. This is a very relevant topic as December is the most dangerous month for electrical fires. I have made 3 quick tips that you can try that could protect your precious electronics and perhaps even your life. 1) Don't Daisy Chain Power strips This is more common than you think. Daisy chaining power strips is when you plug one power strip into the other. I'm not sure why but most people feel comfortable doing this but it is a bad practice. Daisy chaining results in a spread of the potential surge overload across both strips evenly. Where an overload of X size would trip one power strip, when two are connected 2X the overload is required to cause a trip to occur and so on. In short this practice puts everything you plug into the power strips at risk. It's just not worth it when a good quality extension cord can solve the problem. 2) UPS for Desktop Computer Power surges and brown conditions can burn out computer power supplies and even cook the computer all together. At minimum a new computer power supply is around $100 to replace and if your computer gets fried, well then there's ...



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Один из самых популярных стабилизаторов напряжения LM317 обеспечивает выходное напряжение от 1.25В до 37В при токе в 1.5А. Как правило, для установки выходного напряжения применяют переменный резистор. На приведенной схеме показано, как заменить переменный резистор аналоговым напряжением, формируемым из сигнала ШИМ. Параметры широтно-импульсной модуляции могут устанавливаться внешним контроллером или другой цифровой микросхемой. С помощью RC фильтра низких частот и операционного усилителя можно преобразовать сигнал ШИМ в постоянное напряжение, и тем самым, регулировать напряжением выходной уровень стабилизатора LM317. Изменение скважности импульсов ШИМ дает возможность генерировать аналоговое напряжение на выходе фильтра в диапазоне от 0 до 5В. Операционный усилитель усиливает это напряжение для получения требуемого диапазона. Меняя значения номиналов резисторов R4 и R2 можно получить требуемое усиление. Выбор номинала емкости С1 и резистора R1 фильтра определяется частотой сигнала ШИМ. Номиналы, указанные в схеме, рассчитаны для частоты 1кГц.



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This video shows Tim Cardin's "ManO'war" P-51 Mustang. This mustang's beautiful paint scheme makes this model an eye catcher when it flies over head. Check out the landing gear doors when this model's retracts go up and down in flight. This is one nice warbird! Model Details: Kit: Byron Originals P51, early version with single piece wing · Wing Span: 80 · Weight: 25lbs · Engine: Zenoah G-62 with custom soft mounting · Prop: 22x10 Top Flight power point · Radio: Airtronics RDS 8000 2.4Ghz · Servos: 9 · RX Power: 2S Lipo 1500ma using Align voltage regulator · Landing Gear: Byron Scale main gear with sequencing gear doors upgraded with Robart 5/8 air cylinders Here is a new video of this Byron P-51 Mustang's 100th flight: www.youtube.com Enjoy! PlaneVideoArt Productions



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www.onsemi.com Learn about alternate solutions for driving LEDs. Watch a demonstration of a T8 fluorescent tube light replacement comparing a common switching regulator based solution and a Constant Current Regulator (CCR) biased solution for driving LEDs. See the benefits of using CCR's for driving LED applications.



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